export default class Person {
  constructor(a) {
    this.name = a;
  }
}
var arr = [1, 2, 4];
arr.includes(3);
console.log(arr.includes(3), "arr");
let entries = Object.entries(arr);
console.log(entries);
const pro = new Promise((res) => {
  if (res) {
    res(123);
  }
});

async function fn() {
  let a = await pro();
  console.log(a);
}
fn();
pro.then((res) => {
  console.log(res);
});

let per = new Person("Jerry");
console.log(per.name);